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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Sales: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 210,814 | $ 208,853 | $ 220,602 | $ 225,930 | $ 207,440 | $ 203,582 | $ 209,111 | $ 204,311 | $ 866,199 | $ 824,444 | $ 695,977
Long-term Assets: |  |  |  |  |  |  |  |  |  |  |
Total long-term assets | 239,342 |  |  |  | 255,668 |  |  |  | 239,342 | 255,668 |
North America [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 480,511 | 471,770 | 428,046
Long-term Assets: |  |  |  |  |  |  |  |  |  |  |
Total long-term assets | 86,763 |  |  |  | 89,997 |  |  |  | 86,763 | 89,997 |
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 80,175 | 94,533 | 82,589
Long-term Assets: |  |  |  |  |  |  |  |  |  |  |
Total long-term assets | 45,408 |  |  |  | 58,989 |  |  |  | 45,408 | 58,989 |
Europe and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 305,513 | 258,141 | $ 185,342
Long-term Assets: |  |  |  |  |  |  |  |  |  |  |
Total long-term assets | $ 107,171 |  |  |  | $ 106,682 |  |  |  | $ 107,171 | $ 106,682 |

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